Office chair



FIG. 1 is a perspective view of a office chair showing the new design.

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depict portions of the article that form no part of theclaimed design.

CLAIM The ornamental design for a office chair, as shown and described.